package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate  stringRedisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.验证手机号码的格式
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        //2.获取验证码
        String code = RandomUtil.randomNumbers(6);
        //3.保存验证码(session方式)
//        session.setAttribute("code", code);
       //redis方式
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone, code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        log.debug("发送验证码成功，验证码为：{}", code);
        //4.返回信息
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {

        //1.校验手机号的格式
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        //2.校验验证码
        String code = loginForm.getCode();
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
//        Object cacheCode = session.getAttribute("code");

        //3.如果验证码不一致，返回
        if (cacheCode == null || !cacheCode.equals(code)) {
            return Result.fail("验证码错误");
        }
        //4.判断用户是否存在，如果不存在则创建并保存
        User user = query().eq("phone", phone).one();
        if (user == null) {
            user = createUserWithPhone(phone);
        }
        //5.如果存在，就保存到session或者redis中
        //redis方式
        String  token = UUID.randomUUID().toString(true);
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(
                userDTO,
                new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) ->
                                fieldValue == null ? null : fieldValue.toString())
        );
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY + token, userMap);
        // 设置token有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL,TimeUnit.MINUTES);
//        session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));
        //6.返回信息给前端
        return Result.ok(token);
    }

    @Override
    public Result queryUserById(Long userId) {
        //查询详细
        User user = getById(userId);
        if (user == null) {
            return Result.ok();
        }
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        return Result.ok(userDTO);
    }

    @Override
    public Result sign() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取当前时间
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.判断今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.写入redis setbit key offset 1
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth - 1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取当前时间
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.判断今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取本月截止今天为止的所有的签到记录，返回的是一个十进制的数字
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth))
                        .valueAt(0)
        );
        if (result == null || result.isEmpty()) {
            //没有任何签到结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0) {
            return Result.ok(0);
        }
        //6.循环遍历
        int count = 0;
        while (true) {
            //6.1.让这个数字与1做与运算，得到数字的最后一个bit位 判断这个这个是否为0
            if ((num & 1) == 0) {
                //如果为0，说明为签到，结束循环
                break;
            } else {
                //4.如果不为0，说明已签到，计算器+1
                count++;
            }
            //把数字右移1位
            num >>>= 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
